Try looking at your hands... when i do that in a dream i have like 8 or 11 fingers or theyre just distorted

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This differs from person to person. If you're around people all day, a subtle reality check might be the best choice. Like pushing a few fingers through your palm. Or trying to breathe with your mouth and nose shut. Or try to levitate. These usually work for me.

Another good one is trying to remember how you got here, and what you did previously. In the waking world, you can trace your steps back to the beginning of the day, and probably to the day before that as well. But in dreams, you can't. This doesn't work for everyone, as the minds of some people just tend to put fabricated memories in place.